If the Geth (or the robotic Andromeda equivalent) show up in the new game, I hope for two things to be present in said character's portrayal:
1.
I don't want to see another Pinocchio "I wanna be a real boy/girl!" trope. Legion and the Geth, EDI, Commander Data, etc. its all overdone, and frankly (IMO) rather boring. What makes being like us so special again? Would a machine intelligence really want to experience what emotion is? Would it be at all interested in giving up all of it's innate differences and/or advantages in the name of love?
It's all very sappy and romantic to believe that everyone wants to be just like us but an intelligence based on logic, on viewing the universe in 1s and 0s, would have a wholly different, and alien perspective on things. Sure, a machine can't 'love' like we organics can, but it can also experience the world around it in ways that we cannot hope to possibly imagine. I think that this clip sums up the divergence nicely:
2.
Going off the first point, I don't want to see an AI that actually likes being an AI to be presented as the villain of the narrative. Just because an intelligence doesn't want to be like us ≠ "Kill all Humans"; a robotic entity can recognize the differences between organics and synthetics without a sense of superiority, or genocidal tendencies. In ME 2, Legion and the Geth strove to understand organics, but they didn't want to become them. Understanding is conductive to interaction, and an AI would understand the logic in trying to learn the idiocentricties of organic life, just as learning the perspectives of synthetics will help organics understand them.